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capability

(I) A token, usually an unforgeable data value (sometimes called a
"ticket") that gives the bearer or holder the right to access a
system resource. Possession of the token is accepted by a system
as proof that the holder has been authorized to access the
resource named or indicated by the token. (See: access control
list, credential, digital certificate.)

(C) This concept can be implemented as a digital certificate.
(See: attribute certificate.)